US6884713B2 - Method for forming metal line of semiconductor device - Google Patents
Method for forming metal line of semiconductor device Download PDFInfo
- Publication number
- US6884713B2 US6884713B2 US10/608,082 US60808203A US6884713B2 US 6884713 B2 US6884713 B2 US 6884713B2 US 60808203 A US60808203 A US 60808203A US 6884713 B2 US6884713 B2 US 6884713B2
- Authority
- US
- United States
- Prior art keywords
- metal line
- via contact
- conductive layer
- contact plug
- lower metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76897—Formation of self-aligned vias or contact plugs, i.e. involving a lithographically uncritical step
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76885—By forming conductive members before deposition of protective insulating material, e.g. pillars, studs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/5226—Via connections in a multilevel interconnection structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention generally relates to methods for forming metal line of semiconductor device, and more specifically, to methods for forming metal line of semiconductor device wherein via contact plug is formed without the deposition process of Ti/TiN liner layer and conductive layer filling a via contact hole so that the formation processes of a conductive layer for lower metal line and a conductive layer for via contact plug are performed successively without interruption to minimize the contact resistance between the lower metal line and the via contact plug, thereby simplifying the manufacturing process and improving productivity, characteristics and reliability of the device.
- conductive lines of semiconductor devices used for electrical connection between devices and between a device and an external circuit is formed by filling a contact hole and via hole with conductive material and performing subsequent processes.
- Metal lines are used where low resistance is required.
- Aluminum alloys formed by adding silicon, copper or both of silicon and copper to aluminum, are used as materials for the metal lines for its low resistivity and excellent process characteristics.
- FIGS. 1 a through 1 g are cross-sectional diagrams illustrating a conventional method for forming metal line of semiconductor device.
- a lower metal line 11 is formed on a semiconductor substrate(not shown).
- the lower metal line 11 is an aluminum alloy film, and comprises Ti layers or Ti/TiN layers thereon and thereunder.
- a photoresist film pattern 15 is then formed on the interlayer insulating film 13 .
- the photoresist film pattern 15 is formed by exposure and development process using metal line contact mask(not shown) for forming a via contact hole.
- the interlayer insulating film 13 is etched using the photoresist film pattern 15 as a mask to form a via contact hole 17 exposing the lower metal line 11 .
- the photoresist film pattern 15 is then removed, and Ti/TiN liner layer 19 , which is a bonding layer/diffusion barrier layer, is formed on the entire surface including the inner surface of the via contact hole 17 .
- a tungsten layer 21 filling the via contact hole 17 is formed on the entire surface.
- the entire surface is planarized using the interlayer insulating film 13 as an etch stop layer to form a via contact plug 21 filling the via contact hole 17 .
- a conductive layer 23 for upper metal line is formed to be electrically connected to the via contact plug 21 .
- the conductive layer 23 comprises a stacked structure of a lower Ti/TiN film, a main conductive layer for metal line, and an upper Ti/TiN film.
- the lower Ti/TiN film prevents the main conductive layer from reacting with the interlayer insulating film 13 which is a oxide film when the main conductive layer is an aluminum alloy or a tungsten alloy.
- the lower Ti/TiN film also allows uniform deposition of the aluminum alloy.
- the upper Ti/TiN film serves as an anti-reflective film and improves characteristics of electro-migration.
- a photoresist film patter 25 is formed on the conductive layer 23 .
- the photoresist film pattern 25 is formed by exposure and development process using an upper metal line mask(not shown).
- the conductive layer 23 is etched using the photoresist film pattern 25 as a mask to form an upper metal line electrically connected to the lower metal line 11 .
- FIGS. 2 a through 2 c are SEM photographs illustrating a metal line manufactured in accordance with the conventional method.
- FIG. 2 a illustrates a multi-layer metal line.
- FIG. 2 b illustrates a portion of the multi-layer metal line of FIG. 2 a around the via contact plug, where seams are generated due to unstable deposition of the Ti/TiN liner film 19 .
- FIG. 2 c illustrates the tungsten layer 21 poorly deposited on the unstable Ti/TiN liner film 19 .
- a forming metal line of semiconductor device comprising the steps of: (a) sequentially forming a conductive layer for lower metal line and a conductive layer for via contact plug on a planarized first interlayer insulating film having a contact plug; (b) etching the conductive layer for via contact plug and the conductive layer for lower metal line using lower metal line mask to form a lower metal line; (c) forming a second interlayer insulating film on the entire surface; (d) etching the second interlayer insulating film and the conductive layer for via contact plug using a via contact mask to form a via contact plug; (e) forming a third interlayer insulating film on the entire surface; (f) performing a planarization process to expose a upper surface of the via contact plug; and (g) forming an upper metal line electrically connected to the via contact plug.
- FIGS. 1 a through 1 g are cross-sectional diagrams illustrating a conventional method for forming metal line of semiconductor device.
- FIGS. 2 a through 2 c are SEM photographs illustrating a metal line manufactured in accordance with the conventional method.
- FIGS. 3 a through 3 i are cross-sectional diagrams illustrating method for forming metal line of semiconductor device in accordance with the present invention.
- FIGS. 3 a through 3 i are cross-sectional diagrams illustrating a method for forming metal line of semiconductor device in accordance with the present invention.
- a first interlayer insulating film 43 is formed on the semiconductor substrate 41 having a device isolation film(not shown), a wordline(not shown), a bitline(not shown), and a capacitor(not shown) thereon. Thereafter, the first interlayer insulating film 43 is etched using lower metal line contact mask(not shown) to form a contact hole. The contact hole is then filled to form a contact plug 45 for lower metal line.
- a conductive layer for lower metal line electrically connected to the contact plug 45 and a conductive layer 53 for via contact plug are sequentially formed on the entire surface.
- the conductive layer for lower metal line comprises a stacked structure of a first Ti/TiN layer 47 , a metal layer 49 and a second Ti/TiN layer 51 .
- the metal layer 49 comprises aluminum, copper, tungsten, cobalt, silicon, or combinations thereof.
- the conductive layer for via contact plug comprises aluminum, copper, tungsten, cobalt, silicon, or combinations thereof.
- the materials for the conductive layer 53 are selected to have etch selectivity over the second Ti/TiN layer 51 so that the second Ti/TiN layer 51 serves as an etch stop film in the subsequent etch process of the conductive layer 53 .
- the conductive layer 53 for via contact plug and the conductive layer for lower metal line are etched using lower metal line mask(not shown), which covers a predetermined region of the conductive layer 53 where lower metal line is to be formed, to form a lower metal line 55 .
- a second interlayer insulating film 57 is deposited on the entire surface.
- a via contact plug 59 is formed by etching the second interlayer insulating film 57 and the conductive layer 53 for via contact plug using a mask(not shown) which exposes a portion of the second interlayer insulating film above the metal line 55 except a predetermined region where the via contact plug 59 is to be formed.
- the via contact plug 59 can also be formed by performing a double-exposure using the lower metal line mask(not shown) and a via contact mask and then etching the double-exposed portion of the second interlayer insulating film 57 and the conductive layer 53 for via contact plug.
- a third interlayer insulating film 61 is deposited on the entire surface.
- a planarization process is performed to expose a top surface of the via contact plug 59 .
- the planarization process is an etch-back process or a CMP(Chemical Mechanical Polishing) process.
- a conductive layer 63 for upper metal line electrically connected to the via contact plug 59 is formed.
- the conductive layer 63 for upper metal line comprises the same materials as those of the lower metal line 55 .
- the conductive layer 63 for upper metal line is etched using upper metal line mask(not shown) to form an upper metal line 65 .
- the above-describe method in accordance with the present invention can be applied to formation of a metal line having a structure of three or more layers, in addition to upper and lower metal lines.
- the methods in accordance with the present invention provides simplified manufacturing process and improved productivity, characteristics and reliability by forming the via contact plug without the deposition process of Ti/TiN layer and conductive layer filling a via contact hole so that the formation processes of a conductive layer for lower metal line and a conductive layer for via contact plug are performed successively without interruption to minimize the contact resistance between the lower metal line and the via contact plug.
Abstract
Description
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2002-88117 | 2002-12-31 | ||
KR1020020088117A KR20040061817A (en) | 2002-12-31 | 2002-12-31 | A method for forming a metal line of a semiconductor device |
Publications (2)
Publication Number | Publication Date |
---|---|
US20040137719A1 US20040137719A1 (en) | 2004-07-15 |
US6884713B2 true US6884713B2 (en) | 2005-04-26 |
Family
ID=32709780
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/608,082 Expired - Fee Related US6884713B2 (en) | 2002-12-31 | 2003-06-30 | Method for forming metal line of semiconductor device |
Country Status (2)
Country | Link |
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US (1) | US6884713B2 (en) |
KR (1) | KR20040061817A (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20050070794A (en) * | 2003-12-31 | 2005-07-07 | 동부아남반도체 주식회사 | Method for fabricating metal interconnect of semiconductor device |
KR100571416B1 (en) * | 2003-12-31 | 2006-04-14 | 동부아남반도체 주식회사 | Method of forming multi-layered metal wiring of semiconductor device |
US7361585B2 (en) * | 2004-12-23 | 2008-04-22 | Advantech Global, Ltd | System for and method of planarizing the contact region of a via by use of a continuous inline vacuum deposition |
US7268431B2 (en) * | 2004-12-30 | 2007-09-11 | Advantech Global, Ltd | System for and method of forming via holes by use of selective plasma etching in a continuous inline shadow mask deposition process |
US7132361B2 (en) * | 2004-12-23 | 2006-11-07 | Advantech Global, Ltd | System for and method of forming via holes by multiple deposition events in a continuous inline shadow mask deposition process |
CN110571189B (en) * | 2018-06-05 | 2022-04-29 | 中芯国际集成电路制造(上海)有限公司 | Conductive plug and forming method thereof and integrated circuit |
EP4050644A1 (en) * | 2021-02-24 | 2022-08-31 | Imec VZW | A method for forming an interconnect structure |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6174800B1 (en) | 1998-09-08 | 2001-01-16 | Taiwan Semiconductor Manufacturing Company | Via formation in a poly(arylene ether) inter metal dielectric layer |
US6211085B1 (en) | 1999-02-18 | 2001-04-03 | Taiwan Semiconductor Company | Method of preparing CU interconnect lines |
US6355552B1 (en) * | 1998-05-27 | 2002-03-12 | Stmicroelectronics S.A. | Integrated circuit with stop layer and associated fabrication process |
US20020146899A1 (en) | 2001-04-09 | 2002-10-10 | Samsung Electronics Co., Ltd. | Method of forming metal contact in semiconductor device |
US20020151165A1 (en) * | 2001-04-17 | 2002-10-17 | Chung Henry Wei-Ming | Advanced interconnection for integrated circuits |
US20040224497A1 (en) * | 2003-05-05 | 2004-11-11 | Hans-Joachim Barth | Method to form selective cap layers on metal features with narrow spaces |
-
2002
- 2002-12-31 KR KR1020020088117A patent/KR20040061817A/en not_active Application Discontinuation
-
2003
- 2003-06-30 US US10/608,082 patent/US6884713B2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6355552B1 (en) * | 1998-05-27 | 2002-03-12 | Stmicroelectronics S.A. | Integrated circuit with stop layer and associated fabrication process |
US6174800B1 (en) | 1998-09-08 | 2001-01-16 | Taiwan Semiconductor Manufacturing Company | Via formation in a poly(arylene ether) inter metal dielectric layer |
US6211085B1 (en) | 1999-02-18 | 2001-04-03 | Taiwan Semiconductor Company | Method of preparing CU interconnect lines |
US20020146899A1 (en) | 2001-04-09 | 2002-10-10 | Samsung Electronics Co., Ltd. | Method of forming metal contact in semiconductor device |
US6566241B2 (en) | 2001-04-09 | 2003-05-20 | Samsung Electronics Co., Ltd. | Method of forming metal contact in semiconductor device |
US20020151165A1 (en) * | 2001-04-17 | 2002-10-17 | Chung Henry Wei-Ming | Advanced interconnection for integrated circuits |
US20040224497A1 (en) * | 2003-05-05 | 2004-11-11 | Hans-Joachim Barth | Method to form selective cap layers on metal features with narrow spaces |
Also Published As
Publication number | Publication date |
---|---|
KR20040061817A (en) | 2004-07-07 |
US20040137719A1 (en) | 2004-07-15 |
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Effective date: 20170426 |